In order to realize full-spectrum lighting,excellent blue-cyan phosphors,which can be excited by violet LED chips,are particularly important to compensate for the spectral cyan gap.Herein,we report an efficient and th...In order to realize full-spectrum lighting,excellent blue-cyan phosphors,which can be excited by violet LED chips,are particularly important to compensate for the spectral cyan gap.Herein,we report an efficient and thermally stable Eu^(2+)-doped T-phase blue-cyan phosphor,Ba_(1.3)0_(5)Ca_(0.38)Mg_(0.3)SiO_(4):0.015Eu^(2+)(BCM_(0.3)S:Eu^(2+))through structure design and composition optimization.The emission spectrum presents an asymmetric band peaking at 475 nm with a small Stokes shift under 400 nm excitation.The internal/external quantum efficiencies of this phosphor are up to 82.9%/66.2%,and the integrated emission intensity at 150℃ is maintained at 90% of that at room temperature.Due to the compensation of the blue-cyan gap,the fabricated white lightemitting diode(pc-WLED),made of BCM0.3S:Eu^(2+)combined with the 400 nm chip and other phosphors,shows an ultra-high color rendering index(R_(a)=95.7).These prominent properties give BCM_(0.3)S:Eu^(2+)potential applications in the field of full-spectrum healthy lighting.展开更多
基金supported by the National Natural Science Foundation of China(No.51832005 and No.51972020).
文摘In order to realize full-spectrum lighting,excellent blue-cyan phosphors,which can be excited by violet LED chips,are particularly important to compensate for the spectral cyan gap.Herein,we report an efficient and thermally stable Eu^(2+)-doped T-phase blue-cyan phosphor,Ba_(1.3)0_(5)Ca_(0.38)Mg_(0.3)SiO_(4):0.015Eu^(2+)(BCM_(0.3)S:Eu^(2+))through structure design and composition optimization.The emission spectrum presents an asymmetric band peaking at 475 nm with a small Stokes shift under 400 nm excitation.The internal/external quantum efficiencies of this phosphor are up to 82.9%/66.2%,and the integrated emission intensity at 150℃ is maintained at 90% of that at room temperature.Due to the compensation of the blue-cyan gap,the fabricated white lightemitting diode(pc-WLED),made of BCM0.3S:Eu^(2+)combined with the 400 nm chip and other phosphors,shows an ultra-high color rendering index(R_(a)=95.7).These prominent properties give BCM_(0.3)S:Eu^(2+)potential applications in the field of full-spectrum healthy lighting.
